MITSUBISHI ELECTRIC 5.25 INCH FLEXIBLE DISK DRIVES

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1 MITSUBISHI ELECTRIC 5.25 INCH FLEXIBLE DISK DRIVES MF501B MF503B MF504B 0.5 MB 1.0 MB 1.6 MB SPECIFICATIONS and APPLICATION NOTES The Mitsubishi MF500B range of double sided 5¼ inch flexible disk drives provide high performance and reliability giving a service life of over hours. Industry standard types offering 360KB, 800KB and 1.2MB formatted capacity. New high compliance gimbal mounted head gives long media life and reliable data transfer Excellent timing margin and radial alignment guarantees perfect data interchange between systems MF504B (1.6MB) can read standard 360KB disks MF503B (1.0MB) can be switched for 40 or 80 track operation Dynamic clamping ensures perfect disk centreing Industry standard interface and power connector Latest VLSI technology combines bipolar amplifiers and CMOS logic in a single 80 pin ASIC This booklet gives guidance for applying the range of 5'/4 inch floppy drives. For more details consult the standard specification manual for each model. MITSUBISHI ELECTRIC 1 MF500B series FDD

2 Performance specifications MF501B MF503B MF504B MF504B MFM recording Low density High Density Unformatted Track 6.25KB 6.25KB 6.25KB KB capacity:- Disk 500KB 1000KB 1000KB 1666KB Formatted capacity:- Sector 0.256KB 0.256KB 0.256KB 0.512KB 16 (15) sectors/ Track 4.096KB 4.096KB 4.096KB 7.680KB Track Disk 327.7KB KB KB KB Transfer rate 250kb/S 250Kb/s 250/300Kb/s 500Kb/s Track density per inch 48 tpi 96 tpi 96 tpi 96 tpi Total tracks Access time Track to track 6 ms 3 ms 3 ms 3 ms Average 103 ms 94 ms 94 ms 94 ms Settling time 15 ms 15 ms 15 ms 15 ms Motor speed 300rpm 300rpm 300/360rpm 300rpm Motor start time 250 ms 400 ms 400 ms 500 ms Ready time 700 ms 700 ms 700 ms 700 ms Environmental conditions Operating Storage Transportation Ambient temperature 5 C to 43 C -20 C to 60 C -40 C to 60 C Relative humidity 20% to 80% 10% to 90% 5% to 95% Dimensions Height 41mm Width 146mm Depth 195mm Weight 1.2Kg Reliability MTBF POH or more MTTR 30 minutes Unit life 5 years or POH Media life 3.5 million Error rate Soft error 10-9 bit passes/track Hard error bit Seek error 10-6 bit DC power connector Pin number Voltage 1 +12V DC 2 0V V 4 +5 VDC DC power requirements + 5V ±5% 0.5A typ 0.7A +12V ±5% 0.6A typ 1.0A max PCB A 0.25 frame ground connector is provided adjacent to the DC connector. The cut track option FG isolates the DC OV from the frame ground. MITSUBISHI ELECTRIC 2 MF500B series FDD

3 Signal interface Signal I/O Pin 0V * Spare I/P 2 1 * In use I/P 4 3 Drive select 3 I/P 6 5 Index O/P 8 7 ** Drive select 0 I/P 10 9 Drive select 1 I/P Drive select 2 I/P ** Motor on I/P Direction select I/P MF504B) This line switches between high and low density (MF501B) Standard ready or hold ready available (MF5038 & MF504B) Standard ready, hold ready and disk-change available Step I/P Write data I/P TTL levels Write gate I/P Track 00 O/P Low level (TRUE) OV to + 0.4V Write protect O/P High level (FALSE) + 2.5V to V Read data O/P Input impedance 150 Ohms Side one select I/P Receiver: SN7414N or equivalent ** Ready O/P Driver: SN7438N or equivalent Cabling and termination Up to four drives may be connected by a ribbon cable in a daisy change configuration. A SIL terminator, supplied installed on the PCB, should be fitted to the last drive in the chain. On MF503B and MF5048 jumper TD is installed to terminate drive select. Power on sequence No read/write operation may be performed until 100 ms after DC power is applied. The drive becomes ready after 600 ms (700mS for MF501B). The head must be stepped out to track 00 to provide a reference before track seeking begins. Write precompensation The drive uses high performance read/write heads with good compliance and media contact. This means that no write precompensation should be used. If write precompensation must be used, it should be 150 ns or less. 40 / 80 track switch option (MF503B) The cut track option ST may be cut to change to 40 track mode. A switch may be connected. An 80 track drive should not be used to write 40 track diskettes to be read by a 40 track drive. The PCB must not be damaged by track cuts or solder connections. MITSUBISHI ELECTRIC 3 MF500B series FDD

4 Option settings Brackets around jumper name: (MM) indicates jumper plug should be installed to select the function. Jumper name Function (DS0) DRIVE SELECT 0 enables the drive. (DS1) DRIVE SELECT 1 enables the drive. DS2 & DS3 etc. (MX) Drive is selected regardless of DRIVE SELECT lines (MM) MS Motor controlled by MOTOR ON signal MM (MS) Motor controlled by DRIVE SELECT signal MM MS (MM) (MS) Motor controlled by DRIVE SELECT AND MOTOR ON signal Motor controlled by IN USE signal latched by DRIVE SELECT signal. Option IU must be jumpered. (MF501B motor controlled by MOTOR ON signal) (SR) DC HR DD Standard READY sent on pin 34 (SR) DC (HR) DD HOLD READY sent on pin 34 (MF503B, MF504B) SR (DC) HR (DD) DISK CHANGE (reset by DS) on pin 34 (MF5038, MF504B) SR (DC) HR DD DISK CHANGE (reset by step) on pin 34 SR DC No ready signal sent (RD) Read data pulses inhibited by READY (MF504B) (RI) Index pulses gated by ready signal (SS) SB 360 rpm when high density signal sent (MF504B) 300 rpm when low density signal sent (MF504B) SS (SB) 360 rpm for high and low density (MF504) (SS) SB (ND) Low density 300 rpm set LED lighting conditions (MF503B & MF504B) MF501B LED is lit by IN USE OR DRIVE SELECT (lu) (IS) (IL) If IN USE is set, DRIVE SELECT latches LED on (IU) ) IS (IL) LED lit by sum of DRIVE SELECT above conditions (IU) IS IL LED lit by logical sum of DRIVE SELECT and IN USE. (IV) (IS) IL LED lit by IN USE signal IU IS IL LED lit by DRIVE SELECT signal IU (IS) IL LED will not light (IR) May be used with all the above. Requires that drive is ready before LED will light. Standard or Hold Ready must be selected if (IR) is used. INPUT SIGNALS Side one select Logical 1 selects head 0, logical 0 selects head 1. A 100pS delay must be allowed after side select. After a write operation a 1mS delay (590pS for MF504B at high density) must be allowed before a side change or a track access. Direction select Defines head stepping direction. Logical 1 causes heads to step from the centre outward. Logical 0 causes stepping inward. Step Pulses on this line move the head in the direction selected. The head steps one track on the trailing edge of a negative pulse ( 0 to 1 ). MITSUBISHI ELECTRIC 4 MF500B series FDD

5 Write gate Logical 0 enables data on the write line to be written on the selected side and track. Logical 1 inhibits writing and enables reading. Data cannot be written if the write protect line is at 0 because a write protected disk is present. Read data is output 1mS (590ps for MF504B at high density) after write gate becomes inactive. Write data Data written to the disk is sent on this line. The line is normally at 1 and reverses the write current at the leading edge of a negative-going pulse ( 1 to 0 ). Writing is enabled by 0 on the write gate. Type T1 T2 T3 T4 360rpm HD 150 to 1100ns 2.0µs ± 10ns 4.0µs ± 20ns 3.0µs ±15ns 360rpm LD 150 to 1800ns 3.33µs ± 17ns 6.7µs ± 33ns 5.0µs ±25ns 300rpm 150 to 2100ns 4.0µs ± 20ns 8.0µs ± 40ns 6.0µs ±30ns For MF501B T1= 200 to 2100ns In use Logical 0 lights the LED. (MF503B & MF504B have option jumpers for LED lighting conditions). Motor on Logical 0 turns the motor on. The write gate does not go to 0 until 500mS after the motor on line goes to 0. Normal density (MF504B only) Logical 1 selects high density read/write operation and logical 0 selects normal density. With option jumpers SS shorted and SB open, this line changes the motor rpm and read/write 'operations are performed 400mS after density change, to allow the motor speed to stabilize. When motor rpm is switched the head must be moved to track 00 before reading or writing. With SB shorted and SS open the motor speed is always 360rpm so no waiting or track 00 seek is necessary. OUTPUT SIGNALS Index A 0 pulse of 3.5mS is output once for each revolution of the disk. Track 00 Logical 0 on this line indicates that the head is on track 00. MITSUBISHI ELECTRIC 5 MF500B series FDD

6 Ready This line is at 1 if the door is opened or the lever is up. A 0 is produced when the DC power is applied, a diskette is properly clamped and 2 or more index pulses are detected. Option jumpers select the type of ready signal supplied. Read data This line outputs raw data (combined clock and data signals) converted into logical 0 pulses. Type T1 T2 T3 T4 360rpm HD 2.0µs ± 400ns 4.0µs ± 800ns 3.0µs ± 600ns 300ns ± 150ns 360rpm LD 3.33µs ± 66ns 6.67µs ± 1333ns 6.0µs ± 1200ns 300ns ± 150ns 300rpm 4.0µs ± 800ns 8.0µs ± 16000ns 6.0µs ± 1000ns 300ns ± 150ns For MF503B T4= 1.0µs ± 250ns For MF501B T4= 0.8µs ± 250ns HD High density LD Low density Write protect This signal goes to 0 when a write protected disk is inserted into the drive. Writing is inhibited even if the write gate is active. Control and data timing Note 1 Wait 8ms before issuing a step pulse after changing direction. Note 2 Applies to MF504B at high density. MITSUBISHI ELECTRIC 6 MF500B series FDD

7 Disk Drive and front bezel dimensions MITSUBISHI ELECTRIC 7 MF500B series FDD

8 Test points for alignment procedures MF501B MF503B MF504B Track 00 sensor TPA 1 TPA 1 TPA 4 Read data output TPA 3 TPA 3 TPA 3 Track 00 output TPA 13 TPA 13 TPA 2 Index output TPA 14 TPA 14 TPA 1 Differential head output TPB 9 TPB 10 TPB 9 TPB 10 TPB 5 TPB 6 Option jumper locations Mitsubishi Electric (UK) Ltd., Hertford Place, Maple Cross, Rickmansworth Herts WD3 2BJ Tel Tlx Fax MITSUBISHI ELECTRIC 8 MF500B series FDD

Model: Z1DA-78A. 3.5 Micro Floppy Disk Drive. Specification

Model: Z1DA-78A. 3.5 Micro Floppy Disk Drive. Specification Model: Z1DA-78A 3.5 Micro Floppy Disk Drive Specification Citizen Systems Europe Park House, 643 651 Staines Road, Feltham. TW14 8PA. Tel: +44 20 8893 1900 www.citizen.co.uk Table of Contents TABLE OF